AD7682 datasheet(12/35 Pages) AD

12 / 35 page

AD7682/AD7689

Data Sheet

Rev. H | Page 12 of 35

AD7682

IN1

IN0

VIO

VDD

SDO

REF

REFIN

DIN

SCK

GND

IN3

CNV

IN2

COM

Figure 6. AD7682 WLCSP Pin Configuration

AD7689

IN3

IN2

IN0

VIO

VDD

IN1

SDO

REF

REFIN

DIN

SCK

GND

IN7

CNV

IN4

IN5

IN6

COM

Figure 7. AD7689 WLCSP Pin Configuration

Table 8. AD7682 WLCSP and AD7689 WLCSP Pin Function Descriptions

Pin No.

AD7682

WLCSP

Mnemonic

AD7689

WLCSP

Mnemonic

Type1

Description

B6, B8

VDD

Power Supply. Nominally 2.5 V to 5.5 V when using an external reference and decoupled

with 10 μF and 100 nF capacitors. When using the internal reference for a 2.5 V output,

the minimum must be 3.0 V. When using the internal reference for 4.096 V output, the

minimum must be 4.6 V.

REF

AI/O

Reference Input/Output. See the Voltage Reference Output/Input section. When the

internal reference is enabled, this pin produces a selectable system reference of 2.5 V or

4.096 V. When the internal reference is disabled and the buffer is enabled, REF produces a

buffered version of the voltage present on the REFIN pin (VDD − 0.5 V, maximum), which

is useful when using low cost, low power references. For improved drift performance,

connect a precision reference to REF (0.5 V to VDD). For any reference method, this pin

needs decoupling with an external 10 μF capacitor connected as close to REF as possible.

See the Reference Decoupling section.

REFIN

AI/O

Internal Reference Output/Reference Buffer Input. See the Voltage Reference

Output/Input section. When using the internal reference, the internal unbuffered

reference voltage is present and requires decoupling with a 0.1 μF capacitor. When using

the internal reference buffer, apply a source between 0.5 V and (VDD − 0.5 V) that is

buffered to the REF pin, as described in the REF pin description.

D6, D8

GND

Power Supply Ground.

IN3

No Connection (AD7682).

Analog Input Channel 3 (AD7689).

IN2

IN5

Analog Input Channel 2 (AD7682).

Analog Input Channel 5 (AD7689).

IN6

No Connection (AD7682).

Analog Input Channel 6 (AD7689).

IN3

IN7

Analog Input Channel 3 (AD7682).

Analog Input Channel 7 (AD7689).

COM

Common Channel Input. All input channels, IN[7:0], can be referenced to a common-

mode point of 0 V or VREF/2 V.

CNV

Conversion Input. On the rising edge, CNV initiates the conversion. During conversion, if

CNV is held low, the busy indictor is enabled.

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